Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3acdc28bf537c6…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 04:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0808707c56976197c0992c199e82952c SHA-1: aede91180f429c58da5cbac089908e3a75043712 SHA-256: 7d3acdc28bf537c62ad44503c5b753f430577955b1bb57fb12a8eb5f19844493
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090967c9b00a---jegafodesutowosesivabari.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099daf243ad6---wetiwitilamab.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078d792cbfa3---vunabo.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a922b7a5503---24830552140.pdf
    • http://hyosangjo.com/userfiles/file/20210819161130.pdf
    • https://soalmatematik.com/userfiles/file/jelotesetepininirexuteke.pdf
    • https://haysalon.com/public_html/userfiles/file/69700468258.pdf
    • http://webinaris.biz/ckfinder/userfiles/publics/files/vugimewavixoza.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6606c93b61---rikubipinul.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/48b735701bc12038081992b96a63b077/42703476786.pdf
    • https://sindonis.com/userfiles/file/gemexoriwakumazedu.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/n08ncbhg8kgauav214908j8e76/vewurexafume.pdf
    • http://bkdesign.ee/userfiles/file/92211004136.pdf
    • http://ieeepes-thailand.org/app/webroot/files/files/11542213252.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/sewakal.pdf
    • http://heureka-cz.eu/files/nuxeg.pdf
    • http://kimhoatra.com/upload/fckimagesfile/lilodemuv.pdf
    • https://mebelihome.ru/upload_picture/sijebejinisavarebijizuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=rational+emotive+behavior+theory+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd2d.bin
040b9a6dea14ddcefe185555342046db5024d0bfb54ab05403e0f4afc469225d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2D 10960 bytes
font_01_sfnt_off0000f62b.bin
ba7eb48d75679662a7abf30f52b14df5836afb6d58a115717d1b987b1149b563		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 17952 bytes
font_02_sfnt_off0001249b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1249B 16792 bytes

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